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moish

current leakage in Power Tools

6 posts in this topic

Does somebody have a simple YOUTUBE video on how to check for current leakage in power tools with both 2 and 3 prong plugs using a digital multimeter? If not, can someone post one and/or put the procedure in simple steps on a forum?

Thank you for reading my request. I think this is a very important skill for the DIYer.

Mench

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With power OFF, you could use your OHMeter set to the 20 MegOHM scale (or higher)

and measure the resistance from the power tool case to each of the Line Cord pins.

OR with power applied, and your meter set meter to the lowest milli-amp scale

and read the current from the case to an earth ground, such as the ground terminal of a Wall Outlet.

Some Ground Fault Current Interrupters (GFCI) safety devices trip at about 3ma to 5ma within a few milli-seconds.

Hopefully your power tool should be nowhere near that.

Less than 1/2 milliamp no sensation

1/2 to 2 milliamps Threshold of perception

2 to 10 milliamps muscular contraction

5 to 25 milliamps painful shock (may not be able to let go)

Over 25 milliamps Could be violent muscular contraction

50 to 100 milliamps Ventricular fibrillation

over 100 paralysis of breathing.

That's the reason you should always use GFCI protection with any power tool.

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My questions are now :

1) What should the ohm readings be?

2) Shouldn't the switch be in the "ON" position?

3) How do you test a plug with 3 prongs and what should the reading be in ohms for the ground prong to the metal of the case with the switch in BOTH the "On and OFF" positions'

Thank You,

Mench

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what are we talking about ?

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A grasshopper who doesn't know to continue the discussion in the same topic......

RegUS, you should probably merge this question with the previous discussion:

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Topics merged.

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